.page-about {
  background: var(--ink-800);
  color: var(--text);
  overflow-x: clip;
}

.page-about .about-crumb {
  padding-top: 26px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--grid);
}

.page-about .breadcrumb-list a {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .breadcrumb-list a:hover,
.page-about .breadcrumb-list a:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb-current {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 64px;
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(55, 242, 210, .10) 0%, rgba(7, 20, 38, 0) 62%),
    radial-gradient(90% 80% at 100% 100%, rgba(255, 122, 26, .10) 0%, rgba(7, 20, 38, 0) 60%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .28;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse at 25% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse at 25% 0%, #000 0%, transparent 72%);
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: 36px;
}

.page-about .about-title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 8.2vw, 88px);
  line-height: .98;
  letter-spacing: -.015em;
  color: var(--text);
}

.page-about .about-title span {
  color: var(--cyan);
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--glass);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-facts {
  padding: 22px 20px;
  border: 1px solid var(--cyan-24);
  background: var(--cyan-12);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.page-about .facts-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .facts-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .facts-list li {
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--grid-soft);
}

.page-about .facts-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .facts-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .facts-num em {
  font-style: normal;
  font-size: .62em;
  vertical-align: super;
  color: var(--orange);
}

.page-about .facts-label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--glass);
}

/* ---------- 主体双轨 ---------- */
.page-about .about-body {
  display: grid;
  gap: 32px;
  padding-bottom: 80px;
}

.page-about .rail-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .rail-list {
  display: flex;
  gap: 18px;
  margin: 0;
  padding: 0 0 14px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  border-bottom: 1px solid var(--grid-soft);
}

.page-about .rail-list li {
  flex: 0 0 auto;
}

.page-about .rail-list a {
  display: block;
  position: relative;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}

.page-about .rail-list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 6px;
  height: 1px;
  background: var(--grid);
  transition: background var(--dur) var(--ease), width var(--dur) var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--cyan);
}

.page-about .rail-list a:hover::before,
.page-about .rail-list a:focus-visible::before {
  width: 9px;
  background: var(--cyan);
}

.page-about .rail-back {
  display: inline-block;
  margin-top: 14px;
  padding: 8px 14px;
  border: 1px dashed var(--grid);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--glass);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .rail-back:hover,
.page-about .rail-back:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-about .ch {
  padding: 34px 0 6px;
  border-top: 1px solid var(--grid-soft);
}

.page-about .ch-label {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .ch-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 5vw, 44px);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .ch p {
  margin: 0 0 15px;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--glass);
}

.page-about .aside-note {
  max-width: 46ch;
  margin-top: 16px !important;
  padding: 14px 16px;
  border-left: 3px solid var(--orange);
  background: var(--paper);
  color: var(--ink-700) !important;
  font-family: var(--font-serif);
  font-size: 14.5px !important;
  line-height: 1.72 !important;
}

/* ---------- 编号拆解 ---------- */
.page-about .anatomy {
  display: grid;
  gap: 24px;
  margin-top: 26px;
  padding: 22px 18px;
  border: 1px solid var(--grid-soft);
  background: var(--ink-700);
}

.page-about .anatomy-figure svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 流程清单 ---------- */
.page-about .flow-list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--grid-soft);
}

.page-about .flow-step {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 6px;
  padding: 16px 12px;
  border-bottom: 1px solid var(--grid-soft);
  transition: background var(--dur) var(--ease);
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--dur) var(--ease);
}

.page-about .flow-step:hover,
.page-about .flow-step:focus-within {
  background: var(--cyan-12);
}

.page-about .flow-step:hover::before,
.page-about .flow-step:focus-within::before {
  transform: scaleY(1);
}

.page-about .flow-idx {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.page-about .flow-step:hover .flow-idx,
.page-about .flow-step:focus-within .flow-idx {
  color: var(--cyan);
}

.page-about .flow-name {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .01em;
  color: var(--text);
}

.page-about .flow-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--glass);
}

.page-about .flow-out {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--orange);
}

/* ---------- 图片容器 ---------- */
.page-about .media-figure {
  margin: 28px 0 0;
  border: 1px solid var(--grid-soft);
  background: var(--ink-700);
}

.page-about .media-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--grid-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 阶段手风琴 ---------- */
.page-about .stage-acc {
  margin-top: 22px;
  border-top: 1px solid var(--grid-soft);
}

.page-about .accordion-item {
  border-bottom: 1px solid var(--grid-soft);
}

.page-about .acc-h {
  margin: 0;
}

.page-about .accordion-trigger {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 17px 0;
  border: 0;
  background: none;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  transition: color var(--dur) var(--ease);
}

.page-about .accordion-trigger:hover,
.page-about .accordion-trigger:focus-visible {
  color: var(--cyan);
}

.page-about .stage-no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--grid);
  transition: color var(--dur) var(--ease);
}

.page-about .accordion-trigger[aria-expanded="true"] .stage-no,
.page-about .accordion-trigger:hover .stage-no {
  color: var(--cyan);
}

.page-about .stage-name {
  min-width: 0;
}

.page-about .acc-icon {
  position: relative;
  justify-self: end;
  width: 16px;
  height: 16px;
}

.page-about .acc-icon::before,
.page-about .acc-icon::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform var(--dur) var(--ease);
}

.page-about .acc-icon::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-about .acc-icon::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-about .accordion-trigger[aria-expanded="true"] .acc-icon::after {
  transform: rotate(90deg);
}

.page-about .accordion-panel {
  padding: 0 0 18px;
}

.page-about .accordion-panel p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.78;
  color: var(--glass);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 24px;
  margin-top: 22px;
}

.page-about .team-figure {
  margin: 0;
}

.page-about .role-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .role-item {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--grid-soft);
}

.page-about .role-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--cyan);
}

.page-about .role-desc {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--glass);
}

.page-about .net-figure {
  margin: 26px 0 0;
  border: 1px solid var(--cyan-24);
}

.page-about .net-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .net-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .net-list li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--glass);
}

.page-about .net-list .status-dot {
  margin-top: .55em;
}

/* ---------- 交付节奏 ---------- */
.page-about .std-list {
  margin: 24px 0 0;
  padding: 1px;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--grid-soft);
  border: 1px solid var(--grid-soft);
}

.page-about .std-item {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-700);
}

.page-about .std-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: .03em;
  color: var(--cyan);
}

.page-about .std-text {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--glass);
}

/* ---------- 合作价值 ---------- */
.page-about .value-grid {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .value-item {
  padding: 20px 18px;
  background: var(--paper);
  border-top: 3px solid var(--orange);
}

.page-about .ch .value-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: .01em;
  color: var(--ink-900);
}

.page-about .ch .value-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-700);
}

.page-about .value-cta {
  margin-top: 26px;
  padding: 20px 18px;
  border: 1px solid var(--cyan-24);
  background: var(--ink-700);
}

.page-about .ch .value-cta p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.78;
  color: var(--glass);
}

.page-about .value-cta .about-actions {
  margin-top: 18px;
}

@media (min-width: 620px) {
  .page-about .anatomy {
    padding: 26px 24px;
  }

  .page-about .std-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .value-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .flow-step {
    grid-template-columns: 46px minmax(0, 1fr);
    padding: 18px 16px;
  }

  .page-about .accordion-panel {
    padding-left: 58px;
    padding-right: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 56px 0 84px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, .84fr);
    align-items: end;
    gap: 56px;
  }

  .page-about .about-facts {
    padding: 26px 22px;
  }

  .page-about .anatomy {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
    gap: 32px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: 34px;
  }

  .page-about .ch {
    padding-top: 44px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .rail-list {
    display: grid;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
    border-bottom: 0;
  }

  .page-about .rail-list li + li {
    border-top: 1px solid var(--grid-soft);
  }

  .page-about .rail-list a {
    padding: 11px 0 11px 14px;
    white-space: normal;
  }

  .page-about .rail-list a:hover::before,
  .page-about .rail-list a:focus-visible::before {
    width: 9px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-step::before,
  .page-about .acc-icon::before,
  .page-about .acc-icon::after {
    transition: none;
  }
}